1991 Audi 100 Avant S4 engine fastener tightening specifications

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Condition	Value

expand_moreAir intake system

expand_moreIntake manifold


All Audi gasoline straight-5 2.2 L AAN engines	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreAuxiliary assemblies

expand_moreAuxiliary drive belt tensioner


S4 Turbo quattro with gasoline straight-5 2.2 L 227 HP, 350 N⋅m engine (1991.9–1994.6)	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreCylinder head


Camshaft bearing	11.06 lbf⋅ft11.06 lbf⋅ft15 N⋅m

expand_moreCylinder head screws

Figure 1. Cylinder head, Cylinder head screws.


First stage	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Replace screws. See figure 1.
Second stage	44.25 lbf⋅ft44.25 lbf⋅ft60 N⋅m

expand_moreAll Audi gasoline straight-5 2.2 L AAN engines


Third stage	90°90°90°
Fourth stage	90°90°90°


Valve cover	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreEngine block

expand_moreConnecting rod bearing

expand_moreS4 Turbo quattro with gasoline straight-5 2.2 L 227 HP, 350 N⋅m engine (1991.9–1994.6)


First stage	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace screws.
Second stage	90°90°90°

expand_moreCrankshaft central screws

expand_moreAll Audi gasoline straight-5 2.2 L AAN engines


Special tool 2079	258.15 lbf⋅ft258.15 lbf⋅ft350 N⋅m
Replace screws.
Otherwise	331.9 lbf⋅ft331.9 lbf⋅ft450 N⋅m
Replace screws.

expand_moreFlywheel

expand_moreAll Audi gasoline straight-5 2.2 L AAN engines


First stage	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m
Replace screws.
Second stage	180°180°180°

expand_moreMain bearing


S4 Turbo quattro with gasoline straight-5 2.2 L 227 HP, 350 N⋅m engine (1991.9–1994.6)	47.94 lbf⋅ft47.94 lbf⋅ft65 N⋅m
Use new screws.

expand_moreVibration damper


All Audi gasoline straight-5 2.2 L AAN engines	18.44 lbf⋅ft18.44 lbf⋅ft25 N⋅m

expand_moreEngine control

expand_moreCamshaft timing gear


All Audi gasoline straight-5 2.2 L AAN engines	47.94 lbf⋅ft47.94 lbf⋅ft65 N⋅m

expand_moreDrive belt tensioner device

expand_moreS4 Turbo quattro with gasoline straight-5 2.2 L 227 HP, 350 N⋅m engine (1991.9–1994.6)

expand_moreM6


Hexagon head screws	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreM8


Hexagon head screws	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m
Hexagon head screws	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m

expand_moreToothed belt guard at the bottom


S4 Turbo quattro with gasoline straight-5 2.2 L 227 HP, 350 N⋅m engine (1991.9–1994.6)	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreToothed belt tightener

expand_moreS4 Turbo quattro with gasoline straight-5 2.2 L 227 HP, 350 N⋅m engine (1991.9–1994.6)


M6	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m

expand_moreM8


Hexagon head screws	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Otherwise	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreEngine lubrication


Oil drain plug	29.5 lbf⋅ft29.5 lbf⋅ft40 N⋅m

expand_moreOil sump

expand_moreAll Audi gasoline straight-5 2.2 L AAN engines


M6	7.38 lbf⋅ft7.38 lbf⋅ft10 N⋅m
M8	14.75 lbf⋅ft14.75 lbf⋅ft20 N⋅m

expand_moreEngine management

expand_moreLambda sensor


All Audi gasoline straight-5 2.2 L AAN engines	40.57 lbf⋅ft40.57 lbf⋅ft55 N⋅m

expand_moreEngine mounting

expand_moreTorque arm


All Audi gasoline straight-5 2.2 L AAN engines	33.19 lbf⋅ft33.19 lbf⋅ft45 N⋅m

expand_moreExhaust system

expand_moreExhaust manifold


All Audi gasoline straight-5 2.2 L AAN engines	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m
Replace nuts.

expand_moreIgnition system


Spark plugs	22.13 lbf⋅ft22.13 lbf⋅ft30 N⋅m

Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 1991 Audi 100 Avant S4 user's manual. Keep in mind that all information here is provided “as is” without any warranty of any kind.

Before doing any DIY service please check your insurance policy and Audi warranty policy for your region. In some regions DIY service may invalidate your warranty.

Maintenance Items

Engine Fastener Tightening Specifications
Front Suspension Fastener Tightening Specifications
Rear Suspension Fastener Tightening Specifications
Transmission Fastener Tightening Specifications

Service Intervals

Conquer your fears and never give up!

DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow Audi 100 Avant S4 service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.

Doing basic service for your 1991 Audi 100 Avant S4 you're not only saving money, but also also improving your technical skills and learning something new.

1991 Audi 100 Avant S4 C4 Engine Fastener Tightening Specifications

Table of Contents

Conquer your fears and never give up!

Audi 100 Avant S4 C4 model years

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